Hot-blast-stove appliance.



C. A. ORB. Hor Busi sovf APPLMHCE.

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HOT BLAST STOVE APPLIANCE.

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Patented July 25, 1916.

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-IOT-BLAST-STOVE APPLIANCE.

v Specification of Letters Patent.

Patented July ,25. 1 91 Application filed August 3, 1915. Serial No. 43,452.

`To'all whom 'it may concern:

4Be it known that I, CHESTER A. (lim, a

.citizen of the VUnited States, and resident of Cleveland, in the county of Cuyahoga and 'State of Ohio, have invented certain new checker work of such hot blast stoves.

AIl 5 YHeretofore, in so far as I am aware, in

vvbilrn'ingdhe blast furnace gases to heat the checker Work lof hot blast stoves, the air suply has been induced by the draft createdl the Stack of the hot blast stove and the blast furnace gases have been supplied to the hot/blast stove combustion chambenunder slight ressure which varies from time to 1 time.

'of'iair yavailable has been insufficient and the -.volumeofngas has fluctuated. 2N

"heating `value, mix very poorly with air Vwhen used in the large quantities necessary he result has been that the volume Blast furnace gases,` which are low in in heating hot blast stoves, and as a result, withfthe appliances used heretofore, a long flame is produccdin the combustion chamber instead of the .desired short flame by which concentration of the heatof combustion is effected.

Oneobject of my invention is to provide a hot fblast stove appliance which will thoroughlymix the gas and air necessary for combustion, prior to the entrance thereof into the stove combustion chamber.

Another object of the invention is to provide a hotfblast stove appliance having novel means whereby the air mixed with the blast furnace gas is forced into 'the combustion Achamber under pressure to the end that the quantity of air available for use is materially increased, the stream of air induces a iiow of gas into the combustion chamber, and the air and gas are thoroughly mixed before entering the stove combustion cham- A still further object of the invention is to providel a hot blast stove appliance having improved means whereby sulicient quantities of gas and air are supplied to lessen the time required in transferring a given to the inlet end of the mixing pipe 11.

amount of heat from the burning gases -t'o the hot blast stove checker work.

Referring now to the drawings forming part of this specification, Figure l is an elevation partly in section, showing my improved stove appliance as applied to the combustion chamber of a hot' blast stove in accordance with my invention. Fig. 2 is an elevation, partly in section, showing the mixing pipe of myimproved stove appli ance on a larger scale.

In the accompanying drawings, the numeral 2 designates the metal shell of a hot blast stove, having a rcfractorylining 3. The stove shown, which is of the two-pass side combustion chamber type, i` provided with a vcr-ical combustion chamber 4 which opens into the top 5 of the stove. The space G of the stove is filled with checker Work (not shown) in the usual known manner, and the outlet opening 7 at the lower'end of the checker work connects with a chimney valve 8, Ithis connection '7 also serving as an inlet for the cold blast heated by the stove, the

cold blast entering through the chimney valve 8 from' the cold blast pipe which is connected` to the end of the elbow 9 on the body of the valve 8. Y

The combustion chamber l is provided at its lower end with an inlet 10 for the mixed gas and air, and connected to the outer end of the inlet 1() is a mixing pipe 11. The mixing pipe 1l extends horizontally and has an upwardly extending elbow 12 on its -outer end connected to the lower. contracted end 13 of the branch gas main 14 which is connested at its inlet end to the horizontally ex-4 extension 17 is provided with a rotary fan 1S driven by means of a turbine 19 which supplies to the mixing pipe 11 the air neces-A sary to support combustion of thel blast furnace gases. The extension 17 within which the blades of the fan 18 are located, has a' disc/barge end which extends forwardly within the elbow 12 on the mixing pipe 11 As shown, the mixing pipe 11 is 'suspended from the contracted end 13 of the branch main 14, and is movable relative thereto to shut off theigas supply to the milking pipe. The lower end 13 of the branch gas main 14 is provided with a horizontal, stationary' slide 20, and connected to the upper end o f 4the elbow 12 on the mixing pipe 11 is a similar slide 21. Counterweighted levers 22 on opposite sides of the vertical center of the branch main 14 provide means for holdingr the flat faces of the guide plate20 and valve 21,- in-yielding engagement, itnd the bent levers 22 ai'e pivoted atone end tothe slidevalve 21. The opposite ends of the 'levers 22 are connected by the bolt or rod by which the counterweight 23 is secured between the levers 22. Antifriction rollers 24 pivoted'to an intermediate point in the length of the levers 22 are arranged to` travelon the tracks 25 formed on the upper surfaces of the slide 20. The teeth of thel racks 26 on the lower face at the sides of. the

slide 20mesh with the teeth of the pinions 27 on the shaft 28 which is secured in bear.- ings 29 on the slide 21on the lower end of the branch pipe 14x A hand wheel 30 on one end of this shaft provides means for rotating the shaft to slide the suspended mixing pipe 11 into and out of open position (that shown in Figs.` 1 and 2) on the lower end of the branch 'pipe' 14. within the branch pipe 14 between the gas main 15 and mixer pipe is a butterfly valve 3l and on the outer end of the @haft by which the valve is pivoted within the branch pipe is a lever arm 33. Atene side o f' the branch pipe is a' gasometer, the bell 34 of which is arranged-to be raised and'lowered within thestationary lower section forming t the water chamber 35, with variations in the pressure of the gas withinf the gasometer. Extending upwardly within the water chamber 35 of the gasometer, with its upper end opening into the bell 34, is a gas pipeV 36 vwhich is 'connected to the branch pip'e 14 between the butterflyA valve 31 and the uiixing pipe 11 on the lower end of the branch pipe. The bell 34'is connected by a cable -or similar flexible connection 37 to one end of the leverarm 33 on the valve shaft 32 and the other end of this lever is connected by a similar flexible connection 39 to thewith the bell 34 of the gasometer connected to the butterfly valve 31, and with the interior of4 the bell connected by the pipe 3G to the branch pipe 14 between the butterfly valve and the mixing pipe of the stove appliance, an increase in the gas -pressurewithin the branch pipe .14,below the butterfly valve will raise' the bell 34. It also will be readily seen that in such case the counterweight 40 will operate to close the valve 31 and lessen oi shut off' the gas supply so as to reduce the volume and pressure of' the gas within the pipe 14 below the valve 31.

Positioned terweight 40, the bell 34 of the gasometer I will fall and downward movement of-the bell will mo've the lever arm 32 and cause the valve 31 to open, so as to increase the gas supply. Instead of lattaching the mixing pipe to the branch pipe as shown in Figs. 1 and 2, the mixing pipe may be permanently secured to the lower end of the branch pipe so as to not be movable relative thereto, as will be readily understood. f

In the use of my improved stove appli-A ance, the inlet opening 10 into the combus- Nalon chamber 4 is opened and the hand wheel 30 is turned to move the forward end ofthe mixing pipe 11 into position relative to the inlet 10 shown in the drawings. This movement of the mixing pipe 'will admit gas into the mixing pipe from the branch main 14. v

The turbine 19 on the end of the extension 17 is started so as to operate the fan 18 and force a current of air thrugh the extension 17 into the mixing `pipe 11. The air and gas, which become thoroughly mixed in the mixing pipe 11, pass into the combustion chamber 4 of' the stove and Aare burned there- -in. The products of combustion pass upwardly within the .combustion chamber 4 and then pass downwardly through the checker work in thevspace 6 and out of the branch opening 7 through-the chimney valve S of' the branch pi e which connects at its l' bottom end to a lli ek leading to the stove stack or chimney. By varying the speed of th'e turbine 19 driving the fan 18 the volume and pressure of Athe air supplied to the mix- 'ing pipe 11 of my stove appliance'is regu- '5.

lated and. controlled, and by varying `the vvolume and pressure ofl the-entering airpthe volume o gas induced to flow intolfthemixing pipe from the branch gas pipe'fisre u lated and controlled. The supply from l 'i the gas main will vary both in pressure and in volume, Aand fluctuations in pressure or volume of the gas supply will be reflected in the gasometer so that by the regulation of..

the butterfly valve 31 through the inedium-1 of 'the bell 34 of the gasometer, a constant supply of gas to the mixing pipe 11, with a variable gas supply jfrom the gas main 15 is insured.

The advantages of my invention, which will be appreciated by those skilled in the art, arise from the increased volume of air suppliedthrough the stove appliance to the stove combustion chamber and from in- .enabl s the constant supply of gas to-be maint ined. e 4

Modifications in the construction and arrangement of the apparatus forming my improved stove appliance may be made without departing roin my invention as defined in the appended claims.

I claim 1. A hot blast stove appliance comprising in combination a mixing pipe for supplying gas and air to the stove combustion chamber, a gas supply main, a gas inlet pipe connecting the mixing pipe and gas supply main, an air inlet pipe having an extension projecting forwardly within the mixing pipe, and a turbine driven fan at the inlet end of said extension for supplying air under pressure to said mixing pipe.

2. A hot blast stove appliance comprising in combination a mixing pipe for supplying gas and air to the stove combustion chamber, ii gas supply main, a gas inlet pipe connecting the mixing pipe and gas supply main, an air inlet pipe having an extension projecting forwardly within the mixing pipe, a turbine driven fan on said extension for supplying air under pressure to said mixing pipe, and means for regulating the gas supply to said mixing pipe.

3. A hot blast stove appliance comprising in combination a mixing pipe movable into and out of position to supply gas and air to the stove combustion chamber, means for moving said mixing pipe into and out of operative position relative to the stove combustion chamber, a gas supply main, a gas inlet pipe connecting the mixing pipe and gas supply main, an air inlet thereon having an extension for supplyingr air to said mixing pipe, a fan mounted in said extension, and a variable speed turbine for driving said fan to supply air under pressure to said mixing pipe.

4. A hot blast stove appliance comprising' in combination a mixing pipe movable into and out of position to supply gas and air to the stove combustion chamber, means for moving said mixing pipe into and out of operative position relative to the stove combustion chamber, a gas supply main, a gas inlet pipe connecting the mixing pipe and branch pipe on the gas supply main, an air inlet pipe having an extension for supplying air to said mixing pipe, a fan mounted in said extension, a variable speed turbine for driving said fan to supply `air under pressure to said mixing pipe, and means on the gas supply main for regulating the gas supply to said mixing pipe.

5. A hot blast stove appliance comprising in combination a mixing pipe movable into and out of position for supplying gas and air to the stove combustion chamber, a gas supply main, means for moving said mixing i e into and out of operative position, a gas in et ipe`on said mixing pipe connecting the mixing pipe and gas supply main, an air inlet pipe on the mixing pipe having an ex tension for supplying air to said mixing pipe, a fan mounted in said extension to supply air under pressure to said mixing pipe, a variable speed turbine for driving said fan, a valve in said'gas supply main, and a gasometer operatively connected to said valve for actuating the valve to automatieally regulate the gas supply to said mixing pipe 6. A bot blast stove appliance comprising in combination a mixing pipe having an outlet leadimgr to the stove combustion chamber, a gas supply main, an inlet pipe on said mixing pipe connected to the gas supply main, an air inlet pipe on the mixing pipe having an extension projecting forwardly within the mixing pipe` and a motor driven fan ou the inlet end ol said extension to supply air under pressure to said mixing pipe. y

ln testimony whereof I have hereunto set my hand.

(llll''llllt A. URK. Witnesses lil. R. NnLsoN, lV. il. ZiiiiunuiuAN. 

